maint: Sort .gitignore

Sorting of the .gitignore file was broken after the last addition. After
a clean build the scripts re-sort it making the working tree dirty.

.gitignore

-.#*
 *#*#
 *.#*#
 *.a
@@ -18,6 +17,7 @@
 *.rej
 *.s
 *~
+.#*
 .deps
 .gdb_history
 .git